multer vulnerable to Denial of Service via orphaned disk writes on aborted uploads
At a glance
Severity
MEDIUM 5.3
EPSS
EPSS 0.53 % · percentile 45 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
openjs
NVD status
Awaiting Analysis
Description
multer is a Node.js middleware for handling multipart/form-data uploads. In versions 2.2.0 through 2.3.0, when a request using disk storage is aborted mid-upload, file writes that complete after multer has already run its abort cleanup are not removed, so each aborted upload can leave an orphaned file on disk. A remote unauthenticated attacker can repeatedly start and abort uploads to accumulate orphaned files and exhaust disk space, causing a denial of service. The issue is fixed in multer 2.4.0, and users should upgrade to 2.4.0 or later.
